The Ballad of the Daltons

Lucky Luke : La Ballade des Dalton is a 1978 French animated film written and directed by René Goscinny, Morris, Henri Gruel and Pierre Watrin starring the comic book character Lucky Luke. Two different adaptations of the film in book form were both published in French in 1978. The first, adapted by Guy Vidal, was in text form rather than comic strip, and was accompanied by images from the film. The second was a comic strip adaptation by an uncredited Pascal Dabère and formed part of the book, La Ballade des Dalton et autres histoires.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.